<template>
  <div>b</div>
</template>
<script>
export default {
  created() {
    console.log("b --- created");
  },
  activated() {
    console.log("b --- 被激活了");
  },
    deactivated() {
    console.log('b --- 失活');
  }
};
</script>
<style>
</style>